Attenuation is a loss of power over distance. In networking, the solution is to add an amplifier to amplify the weakening signals.
Attenuation
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Fibre-Optic Cable
Although it still faces possible degradation as the light travel down in the fibre, the deterioration is usually less than its copper counterpart. There are primarily four form of deterioration for the light pulse: attenuation#, dispersion and non-linearities#, chromatic distortion#, and polarisation or mode distortion#.